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Peroxide Electrochemical Sensor and Biosensor Based on Nanocomposite of TiO2 Nanoparticle/Multi-Walled Carbon Nanotube Modified Glassy Carbon Electrode

机译：基于纳米TiO2 /多壁碳纳米管修饰玻碳电极的纳米复合材料的过氧化物电化学传感器和生物传感器

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A hydrogen peroxide (H O ) sensor and biosensor based on modified multi-walled carbon nanotubes (CNTs) with titanium dioxide (TiO ) nanostructures was designed and evaluated. The construction of the sensor was performed using a glassy carbon (GC) modified electrode with a TiO –CNT film and Prussian blue (PB) as an electrocalatyzer. The same sensor was also employed as the basis for H O biosensor construction through further modification with horseradish peroxidase (HRP) immobilized at the TiO –fCNT film. Functionalized CNTs (fCNTs) and modified TiO –fCNTs were characterized by Transmission Electron Microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), and X-Ray DifFraction (XRD), confirming the presence of anatase over the fCNTs. Depending on the surface charge, a solvent which optimizes the CNT dispersion was selected: dimethyl formamide (DMF) for fCNTs and sodium dodecylsulfate (SDS) for TiO –fCNTs. Calculated values for the electron transfer rate constant (ks) were 0.027 s at the PB–fCNT/GC modified electrode and 4.7 × 10 s at the PB–TiO /fCNT/GC electrode, suggesting that, at the PB–TiO /fCNT/GC modified electrode, the electronic transfer was improved. According to these results, the PB–fCNT/GC electrode exhibited better Detection Limit (LD) and Quantification Limit (LQ) than the PB–TiO /fCNT/GC electrode for H O . However, the PB film was very unstable at the potentials used. Therefore, the PB–TiO /fCNT/GC modified electrode was considered the best for H O detection in terms of operability. Cyclic Voltammetry (CV) behaviors of the HRP–TiO /fCNT/GC modified electrodes before and after the chronoamperometric test for H O , suggest the high stability of the enzymatic electrode. In comparison with other HRP/fCNT-based electrochemical biosensors previously described in the literature, the HRP–fCNTs/GC modified electrode did not show an electroanalytical response toward H O .
机译：设计并评估了基于具有二氧化钛（TiO）纳米结构的改性多壁碳纳米管（CNTs）的过氧化氢（H O）传感器和生物传感器。传感器的构造使用带有TiO-CNT膜和普鲁士蓝（PB）的玻璃碳（GC）修饰电极作为电渗析仪。通过用固定在TiO -fCNT薄膜上的辣根过氧化物酶（HRP）进一步修饰，同一传感器也被用作H O生物传感器构造的基础。通过透射电子显微镜（TEM），傅立叶变换红外光谱（FTIR）和X射线衍射（XRD）对功能化的CNT（fCNT）和改性的TiO -fCNT进行了表征，证实了在fCNT上存在锐钛矿。根据表面电荷，选择了优化CNT分散性的溶剂：用于fCNT的二甲基甲酰胺（DMF）和用于TiO -fCNTs的十二烷基硫酸钠（SDS）。在PB–fCNT / GC修饰电极上，电子传递速率常数（ks）的计算值为0.027 s，在PB–TiO / fCNT / GC电极上为4.7×10 s，表明在PB–TiO / fCNT /电极上GC修饰电极，电子传递得到改善。根据这些结果，PB-fCNT / GC电极对H O的检测限（LD）和定量限（LQ）优于PB-TiO / fCNT / GC电极。然而，PB膜在使用的电势下非常不稳定。因此，就可操作性而言，PB-TiO / fCNT / GC修饰电极被认为是检测H O的最佳选择。 HRP – TiO / fCNT / GC修饰电极在H O计时电流测试之前和之后的循环伏安（CV）行为表明酶电极的高稳定性。与先前在文献中描述的其他基于HRP / fCNT的电化学生物传感器相比，HRP–fCNTs / GC修饰电极未显示出对H O的电分析响应。

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